package org.smart4j.chapter2.util;

import org.slf4j.LoggerFactory;
import org.slf4j.Logger;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public final class PropsUtil {
    private static final Logger LOGGER= (Logger) LoggerFactory.getLogger(PropsUtil.class);
    public static Properties loadProps(String fileName) {
        Properties props=null;
        InputStream is=null;
        try{
            is=Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
            if(is==null) {
                throw new FileNotFoundException(fileName+"file is not found");
            }
            props=new Properties();
            props.load(is);
        }catch (IOException e) {
            LOGGER.error("load properties file failure",e);
        } finally {
            if(is!=null) {
                try{
                    is.close();
                }catch (IOException e) {
                    LOGGER.error("close input stream failure",e);
                }
            }
        }
        return props;
    }
    public static String getString(Properties props,String key) {
        return getString(props,key,"");
    }
    public static String getString(Properties props,String key,String defaultValue) {
        String value=defaultValue;
        if(props.containsKey(key)) {
            value=props.getProperty(key);
        }
        return value;
    }
    public static int getInt(Properties props,String key,int defaultValue) {
        int value=defaultValue;
        if(props.containsKey(key)) {
            value=CastUtil.castInt(props.getProperty(key));
        }
        return  value;
    }
    public static boolean getBoolean(Properties props,String key) {
        return getBoolean(props,key,false);
    }
    public static boolean getBoolean(Properties props,String key,boolean defaultValue) {
        boolean value=defaultValue;
        if(props.containsKey(key)) {
            value=CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }
}
